The objective of this thesis lies in the seismic modelling of a multistorey slab-column frame structure to be tested on a real scale in laboratory at the middle of this year, with the purpose of expanding the existing information on behavioural matters of this type of structures and knowledge about the response at connections between structural elements in mixed lateral-gravitational load situations. At the beginning, this document contains the main theories, models and structural provisions regarding the most relevant expected problem in this kind of buildings: The Punching Shear Phenomena. Once the principal concepts have been clarified, as well as the factors that predominantly affect the structural performance and capacity against punching shear forces in presence of seismic action, a comparison between the structural code provisions related to punching shear in flat-slabs with or without transversal reinforcement will be carried out, considering three important structural codes: Eurocode, ACI 318 and Model Code 2010. Finally, the case study of this thesis is presented, in which two models are described and analysed through finite element modeling. Subsequently, the elect model is seismically designed considering the slabs and columns as secondary elements and the shear walls as primary elements in the face of the perspective of a high ductility design (DCH) following what is described in the Eurocode. Punching shear checks are carried out in the slab-column connections, and the need to introduce transversal reinforcement in the areas inside the critical perimeter in edge and angle connections is derived. It concludes with the design and verification of the proposals punching shear reinforcement arrangements.
Lo scopo di questa tesi è la modellazione sismica di una struttura a telaio piastre-pilastri da sottoporre ad una prova in scala 1:1 in laboratorio durante quest’anno. L’obiettivo è di accumulare più informazioni possibili su questo tipo di strutture, giacchè si hanno pochi dati sperimentali a riguardo. Maggiore attenzione verrà posta nell’acquisire dati sulla risposta delle connessioni tra elementi strutturali in situazioni di carico misto laterale e gravitazionale (orizzontale e verticale). All’inizio questo documento contiene le principali teorie, modelli e disposizioni strutturali riguardanti il problema più rilevante in questa tipologia costruttiva: il fenomeno di taglio a punzonamento. Una volta che i concetti principali sono affrontati, così come i fattori che influenzano prevalentemente la prestazione e la capacità strutturale contro le forze di taglio in presenza di azioni sismiche, si effettuerà un confronto tra le disposizioni strutturali relative al taglio a punzonamento in piastre-piatte armate o non-armate considerando tre importanti codici strutturali: Eurocodice, ACI 318 e Model Code 2010. Infine, viene presentato il caso di studio di questa tesi, in cui due modelli sono descritti e analizzati attraverso la modellazione ad elementi finiti. Successivamente, il modello eletto è progettato sismicamente considerando le piastre e le colonne come elementi secondari e le pareti di taglio come elementi primari di fronte alla prospettiva di un design di alta duttilità (DCH) seguendo quanto descritto nell’Eurocodice. I controlli di punzonamento sono eseguiti nelle connessioni piastra-pilastro e viene derivata la necessità di introdurre rinforzo transversale nelle aree all’interno del perimetro critico in connessioni di bordo e di angolo. Si conclude con la progettazione e la verifica delle armature proposte come rinforzo alle forze di taglio.
Seismic design and punching shear analysis of a r.c. slab-column frame
ELLIOTT, LUCIANO
2017/2018
Abstract
The objective of this thesis lies in the seismic modelling of a multistorey slab-column frame structure to be tested on a real scale in laboratory at the middle of this year, with the purpose of expanding the existing information on behavioural matters of this type of structures and knowledge about the response at connections between structural elements in mixed lateral-gravitational load situations. At the beginning, this document contains the main theories, models and structural provisions regarding the most relevant expected problem in this kind of buildings: The Punching Shear Phenomena. Once the principal concepts have been clarified, as well as the factors that predominantly affect the structural performance and capacity against punching shear forces in presence of seismic action, a comparison between the structural code provisions related to punching shear in flat-slabs with or without transversal reinforcement will be carried out, considering three important structural codes: Eurocode, ACI 318 and Model Code 2010. Finally, the case study of this thesis is presented, in which two models are described and analysed through finite element modeling. Subsequently, the elect model is seismically designed considering the slabs and columns as secondary elements and the shear walls as primary elements in the face of the perspective of a high ductility design (DCH) following what is described in the Eurocode. Punching shear checks are carried out in the slab-column connections, and the need to introduce transversal reinforcement in the areas inside the critical perimeter in edge and angle connections is derived. It concludes with the design and verification of the proposals punching shear reinforcement arrangements.| File | Dimensione | Formato | |
|---|---|---|---|
|
2018_04_Elliott.pdf
accessibile in internet solo dagli utenti autorizzati
Descrizione: Thesis text
Dimensione
6.05 MB
Formato
Adobe PDF
|
6.05 MB | Adobe PDF | Visualizza/Apri |
I documenti in POLITesi sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/10589/140265